บุญญสิริ ปรียา. “CONSTRUCTIVISM APPROACH IN MATHEMATICS TEACHING”. Academic Journal Phranakhon Rajabhat University 10, no. 1 (May 22, 2019): 369–386. accessed January 19, 2025. https://so01.tci-thaijo.org/index.php/AJPU/article/view/157471.